Is it normal for smoke from the rear of the car in winter?

There are three types of smoke from car engines: white smoke, black smoke and blue smoke. ? (1) In general, if a car engine still has white smoke when it is hot, there may be two situations: the injection advance angle is small and incomplete combustion; the cylinder liner is slightly leaking and the fuel contains water; and the cold engine is started White smoke is emitted, especially when the engine is started at low temperature, but it is normal for the white smoke to disappear as the engine temperature increases. ? (2) There are the following situations when a car engine emits black smoke: the air-fuel ratio is out of balance; the cylinder pressure drops; it will cause black smoke; if black smoke is serious, other issues must be considered. ? (3) Blue smoke emitted by automobile engines is often caused by "burning engine oil". At this time, you should check whether the engine cylinder liner is worn, whether there are "sticky rings", ring alignment, aging and deformation of valve seals, excessive valve guide clearance, etc. , and at this time it is also accompanied by crankcase blow-by. Severe oil discharge from the supercharger will also cause part of the oil to enter the cylinder from the intake passage and cause "blue smoke". If you have a problem with your car, ask the car guru. Professional technicians from 4S stores can solve the problem in 10 minutes.